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Did you see the abnormality on brain window CT?
Although it is visible as a calcific mass in the sphenoid sinus, it is difficult to appreciate and should remind you of the need to review all CT studies on bone window (even if bone algorithm is not available).
A permeative pattern to the body the sphenoid bone shown, extending dorsally, and into the pituitary fossa. This is contiguous with a 2 cm mass filling the body of the sphenoid, with either calcified or ossified matrix. No other destructive lesion is shown. Ventricles and sulci within normal. Ossification of the falx is incidentally noted. The right mastoid air cells are opacified.